Accession Number : ADP008169

Title :   Ultrafast Nonlinear Transmission Changes in a GaAs Single Quantum Well Waveguide Structure Suitable for Ultrafast All-Optical Switches,

Corporate Author : UNIVERSITY OF CENTRAL FLORIDA ORLANDO CENTER FOR RESEARCH IN ELECTRO-OPTICS A ND LASERS

Personal Author(s) : Wa, P. K. ; Miller, A. ; Bambha, R. ; Cavailles, A. ; Moretti, A. L.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : We have previously demonstrated picosecond all-optical switching in a waveguide directional coupler. It was shown that cross-well carrier sweep-out could be used to increase the recovery speed of the device by over an order of magnitude by employing a p-i-n doped structure. In this work, we report time resolved measurements of optical nonlinearities in a waveguide structure containing a single GaAs quantum well which exhibits a fast recovery without the need for an applied electric field. We observe phenomena associated with exciton absorption quenching and screening of the internal field resulting in a dynamic shift of absorption edge by the quantum confined Stark effect.

Descriptors :   *DIRECTIONAL, *ELECTRIC FIELDS, *OPTICAL SWITCHING, *OPTICAL WAVEGUIDES, *WAVEGUIDE COUPLERS, ABSORPTION, DYNAMICS, EDGES, EXCITONS, GALLIUM ARSENIDES, INTERNAL, MEASUREMENT, QUENCHING, RECOVERY, STARK EFFECT, TIME, PIN DIODES, HIGH RATE.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE